Timing output should include both the core task and the total time

[ScottWeinstein]

So this suggestion was originally made on gulpjs here (gulpjs/gulp#189)

If we have the following

gulp.task("compile", ["lint", "sass"], function() {
     // do something which takes 50ms
});

where lint and sass are async

in the current version the output of this might be

lint: 200 ms
sass: 250 ms
compile: 50 ms

which is quite misleading. Really the time it took for compile to complete is Max(lintTime, sassTime) + compileTime

Helpful output for any task would be in include inclusive and exclusive time, say

lint: 200 ms
sass: 250 ms
compile: 50 ms / 350 ms

[robrich]

Seems a duplicate of #14

[iandanforth]

👍